Update MD052/reference-links-images to add a shortcut_syntax parameter for opting into shortcut scanning (fixes #915).

schema/.markdownlint.jsonc

@@ -279,7 +279,10 @@
   "MD051": true,
 
   // MD052/reference-links-images - Reference links and images should use a label that is defined
-  "MD052": true,
+  "MD052": {
+    // Include shortcut syntax
+    "shortcut_syntax": false
+  },
 
   // MD053/link-image-reference-definitions - Link and image reference definitions should be needed
   "MD053": {

schema/.markdownlint.yaml

@@ -252,7 +252,9 @@ MD050:
 MD051: true
 
 # MD052/reference-links-images - Reference links and images should use a label that is defined
-MD052: true
+MD052:
+  # Include shortcut syntax
+  shortcut_syntax: false
 
 # MD053/link-image-reference-definitions - Link and image reference definitions should be needed
 MD053:

schema/build-config-schema.js

@@ -497,6 +497,15 @@ for (const rule of rules) {
         }
       };
       break;
+    case "MD052":
+      scheme.properties = {
+        "shortcut_syntax": {
+          "description": "Include shortcut syntax",
+          "type": "boolean",
+          "default": false
+        }
+      };
+      break;
     case "MD053":
       scheme.properties = {
         "ignored_definitions": {

schema/markdownlint-config-schema.json

@@ -937,8 +937,19 @@
     },
     "MD052": {
       "description": "MD052/reference-links-images - Reference links and images should use a label that is defined",
-      "type": "boolean",
-      "default": true
+      "type": [
+        "boolean",
+        "object"
+      ],
+      "default": true,
+      "properties": {
+        "shortcut_syntax": {
+          "description": "Include shortcut syntax",
+          "type": "boolean",
+          "default": false
+        }
+      },
+      "additionalProperties": false
     },
     "reference-links-images": {
       "$ref": "#/properties/MD052"